Putting aside starting salaries, it's wrong to suggest that public sector employees have been communally "holding us to ransom" every couple of years.
They have, for the most part, been offered below-inflation pay rises (in effect pay cuts) in recent years, and have rightly exercised their right to withdraw their labour.
You either believe in this principal, and put-up with the inconvenience, or you don't.
Private sector employees tend not to have the power of numbers behind them, as they have no union representation. They are then forced to accept paltry (or no) pay-rises, because withdrawal of their labour is not an option. If they tried it, it would result in instant dismissal.
This explains why private sector jobs are lower paid than public sector jobs. The private sector employees are not saints who refuse to strike on the ground of principal - they are too shit-scared to take action, because the principle would lead them down a one-way street to the nearest Job Centre.
It's a fairly clear choice. You either believe in people's right to withdraw their labour, or you believe that the power should be in the hands of the employers. I know which option I think is fairest, and which is most open to abuse.